On 10/08/2014 02:44, Yuanchao Xu wrote:
To kind whom it may concern:I want to draw a map using python, not really a map with full information, just a get together of a series of small shapes to reflect land use. The data is like below |1 2 2 3 3 2 2 3 3 1 1 2 1 1 1 1 3 3 3 3 3 3 4 1| Each number represents one land use type. and their positions in the matrix are their coordinates. I used VBA to do that before, the whole map consists many small square shapes representing land use, but since the data was so large, it took a long time to generate the map, also delete the map. My question are : 1. I wonder in python, is there any more fast way to generate this kind of map, as a whole, not a series of shapes, i think that would be faster？？ 2. I have tried using contourf, as below, but it says "out of bounds for axis 1", but actually, I printed X,Y and cordi, they have the same shape, why still out of bounds? 1. |y= np.arange(0, 4 , 1) x= np.arange(0, 6 , 1) X,Y= np.meshgrid(x,y) # cordi is the matrix containing all the data # pyplot is imported before plt.contourf(X,Y, Cordi[X,Y], 8, alpha=.75, cmap='jet')| 3. Some kind person has suggested me to use imshow to plot. I checked the explanation of imshow, it deals more about images not plots, and it needs a 3D array to plot, in which for each pixel it needs 3 values to show the color. I also tried, not so acceptable. The interfaces of each color are so vague, and besides, when the data is large, it just failed to present. So, if I use imshow, could I have some way to avoid those two problems? Thank you very much for answering!
See http://matplotlib.org/ specifically http://matplotlib.org/basemap/users/examples.html
-- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
